president obama, the first lady, and former president george w. bush and his wife, laura, will leave this morning for planned services later this week. with more, here's alex marquardt. >> reporter: the week of official mourning will continue on tuesday. a memorial service that includes heads of state from around the world. it will be held at the fnb stadium in johannesburg where he made his final public appearance at the world cup in 2010. president obama, the first lady will aten, as will former presidents bill clinton and jimmy carter. mandela will lie in state for three days in the capital. before he's finally laid to rest after a state funeral in his home village of qunu. alexsnú( marquardt, abc news, johannesburg. >> defense secretary chuck hagel is in pakistan this morning. the first pentagon chief to visit since early 2010. he meets with a powerful new general and will then hold talks with the prime minister. things have been some what better lately. >>> lawmakers are demanding answers after the pentagon ordered russian-made helicopters f